Gas pressureised container



3 Sheets-Sheet 1 Filed March 25, 1964 Jan. 11, 1966 D. E. DAVIS GAS PRESSURISED CONTAINER 3 Sheets-Sheet 2 Filed March 25, 1964 I 4 r 1 I 'IIII. E; 5a D Jan. 11, 1966 D. E. DAVIS GAS PRESSURISHD CONTAINER 5 Sheets-Sheet 5 Filed March 25, 1964 United States Patent 3,228,572 GAS PRESSURISED CONTAINER David Ernest Davis, North Sydney, New South Wales,

Australia, assignor to Gas-Pak Pty. Limited, North Sydney, Australia, a company of New South Wales Filed Mar. 25, 1964, Ser. No. 354,601 Claims priority, application Australia, Apr. 10, 1963,

29,419/63; Nov. 27, 1963, 38,145/63 1 Claim. (Cl. 222-394) This invention relates to those containers for fluids which can be discharged therefrom through a valve and delivery tube. The container with fluid therein is adapted to be pressurised by a gas which is admitted to the container through the valve. The valve is connected to the delivery tube and is opened by pressure applied to the delivery tube. As constructed hitherto the valve was incorporated in the container, usually in the cap, and was installed as a permanent fixture after the container was charged with fluid which was to be ejected under pressure by the gas, subsequently admitted, by manual movement of the delivery tube towards the interior of the container. Owing to the pressure involved no economic means have been devised to provide a removable cap for such a container. Consequently, the containers have been discarded after the discharge of a single filling.

The present invention has been devised to provide a container of the type described having means whereby a cap can be removably secured thereto in a manner whereby the ends of the container will safely withstand fluid pressure in the container. As a result of this invention containers of the type described can be easily filled, pressurised and refilled and pressurised as required. The container of this invention can be used economically in many new fields of industry as well :as in existing fields. One advantage resulting from the invention is that a container can be re-pres-surised as many times as is necessary to discharge the fluid content thereof. Another advantage is that the container will safely withstand greater pressure than was practicable hitherto.

According to the invention, the container has an open end and a closed end, said open end being sealed by a removable and replaceable cap. Means connect the cap to the closed end of the container whereby said cap and said closed end will withstand fluid pressure in the container.

Three embodiments of the invention will now be described with reference to the annexed drawings, wherein:

FIGURE 1 is a fragmentary perspective view of the container with the various parts of one form of cap illustrated in exploded perspective relation thereto.

FIGURE 2 is a central sectional elevation of the container and cap in assembled form.

FIGURES 3 and 4 are similar views respectively to FIGURES 1 and 2 illustrating a second form of cap securing means.

FIGURES 5 and 6 are similar views respectively to FIGURES 3 and 4, illustrating a modified form of the cap in which valve control means are incorporated.

In all forms of the present invention, the valve and delivery tube assembly is conventional. This assembly consists of a tubular valve case 1 having an inlet port 2 and which is adapted to be fixed and sealed as at 3 at its upper end on the inside of a container cap. The valve case 1 has the plunger part 4 of a delivery tube 5 freely slidable therein and a spring 6 beneath the plunger 3 normally urges the delivery tube 5 outwardly. The delivery tube 5 incorporates a port 7 normally covered by the seal 3 and a port 8 at right angles thereto in communication therewith and extending through the delivery "ice tube 5. In the forms of the invention illustrated in FIGURES l to 4, the delivery tube 5 has a conventional press button assembly 9 fixed on the outer end thereof, having port 10 in communication with the port 8 and a nozzle 11 thereon. Manual movement of the delivery tube 5 and plunger 4 towards the interior of a container, uncovers the port 7 and allows pressurised fluid to be discharged from the container through the nozzle 11.

As illustrated, the container 12 is cylindrical; it has an open end 13 and an inwardly domed end 14 opposite the open end 13. The open end 13 has a rolled edge 15 and the domed end 14 has a rod 16 with a threaded upper end fixed thereto and projecting axially into the container 12.

In all forms of the invention, the cap 17 has a flange 18 formed to extend over the rolled edge 15 of the container 12, and sealing means such as an O ring 19 is compressed between the flange 18 and the rolled edge 15. The cap 17 has an axial cylindrical boss 20 formed thereon with a central hole 21 in the top. The valve case 1 and seal 3 are fixed in the boss 20 and the delivery tube 5 projects outwardly through the hole 21.

The boss 20 forms with the flange 18 an annulus 22 and a pressure plate 23 having a hollow boss 24 thereon, is mounted on the cap 17 with the boss 24 located in the annulus 22. The cap 17 has, in this embodiment, two diametrically opposed holes 25 formed therethrough and the boss 24 has complementary holes 26 therein to accommodate sleeve sealing washers 27 and screws 28 for clamping the cap 17 onto the top of the container 12 by the screwed rod 16 and a bridge bar 29. The holes 26 are enlarged to receive the washers 27 which latter project out of the holes 26 for sealing engagement with the cap 17 within the annulus 22.

As illustrated in FIGURES l and 2, the screws 28 are fixed at one end in the holes 26 formed in the pressure plate 23 and with the aid of nuts 30 secure the cap 17 to the pressure plate 23. They project through the holes 25 formed in the cap 17 and the bridge bar 29 is fixed on the other ends thereof with the aid of lock nuts 30a. The bridge bar 29 is drilled and threaded for removable connection to the screwed rod 16. When the bridge bar 29 is screwed onto the rod 16 :by rotating the pressure plate 23 the O ring 19 is compressed between the flange 18 of the cap 17 and the rolled edge 15 of the container 12, thus sealing the container 12 to withstand the pressure to be created therein. By securing the cap 17 to the bottom of the container in the manner described a higher factor of safety is achieved in a light weight pressure container than was possible in containers as constructed hitherto.

As illustrated in FIGURES 3 and 4 the bridge bar 29 is replaced by an inverted conical like coupling member 31 which is fixed to the underside of the cap 17 by screws 32 which also connect the cap 17 to the pressure plate 23. The bottom of the coupling member 31 is axially drilled and screwed for connecting to the screwed rod 16.

In the forms of the invention illustrated in FIGURES 1 to 4 a feed tube 34 is fixed directly to the inlet port 2 to the delivery tube 5 or to a port 31a in the coupling member 31 which communicates with the inlet port 2 as the case may be. The feed tube extends to and has its inlet near the bottom of the container.

In the form of the invention illustrated in FIGURES 5 and 6 valve control means are incorporated. For this purpose the hole 21 in the pressure plate 23 is internally screwed as at 35. A control hand wheel 36 having an externally screwed tubular boss 37 formed thereon is mounted by the boss in the screwed part 35. The delivery tube 5 is lengthened to pass freely through the boss 37 and the control wheel 36 so that it can be connected to a nozzle or other appliance. The delivery tube 5 has When this form of the invention (FIGURES 5 and 6) is used on a container which is charged with pressurised gas only, such as Fluro-Carbon or Hydra-Carbon gas, the feed tube 34 is omitted. The discharge of gas from the container can be controlled by the control hand wheel 36 within very fine limits so that an appliance connected to the delivery tube 5 can be operated under the actual conditions for which it has been designed. The container 12 is adapted to be charged with gas (pressurised) through the delivery tube 5 thereof by, for example, the adapter subject of our co-pending Patent Australian Application No. 38,146/63 entitled An Adapter for Connecting a Pressurised Gas Container to a Vessel to be Charged from the Container.

It is to be clearly understood that the invention is not confined to the precise constructions described and illustrated by way of embodiments of the invention. It will be apparent to those skilled in the art, that once the ad vantage of securing the two ends of a container together is appreciated, the valve mechanism can be incorporated in either end of the container.

What I claim is:

Gas pressurised container for fluids having a delivery tube and having a regulating valve thereon, characterised in that the container has an open end and a closed end said open end being sealed by a removable and replaceable cap, said cap having a pressure plate thereon, means to connect the pressure plate and cap to the closed end of the container whereby said pressure plate and cap and said closed end will withstand fluid pressure in the container, said means comprising rods fixed to said pressure plate and projecting through said cap into the container, an inverted conical-like coupling fixed to said rods, said coupling having a screwed portion for engagement with a screwed rod fixed to the closed end of the container and having a port providing communication to the inlet of the valve closed delivery tube.

References Cited by the Examiner UNITED STATES PATENTS 105,933 8/1870 Fowler 222-394 525,955 9/ 1894 Leacock 222-3 1,027,136 5/1912 Mauran 2225 2,305,286 12/1942 Ward 222394 2,518,656 8/1950 Bork 169-31 2,547,954 4/1951 Mapes et a1. 169-31 2,562,111 7/1951 Michel 222-394 2,644,313 7/ 1953 Griggs 2223 X 2,920,638 1/ 1960 Heckefhorn et al. 222-3 X RAPHAEL M. LUPO, Primary Examiner. 

